Hey bro, I want to tell you that you are on the right track, let the prawn fully decay and let your water clear up on its own. Try not to turn on the lights as the spike in nutrients will spark off an algal bloom if the lights are on. Right now just leave your return pump running to get the water flowing. It looks like your tank is at its peak of the cycle, it should clear up from here on out.
Btw, from the picture it looks like you have some corals, but they look artificial, or am I seeing things?